Q: how do i access my photostream form the internet? and how do i change the apps on the icloud home screen?

The only way to see photo stream photos on the internet is to add them to a shared stream with the public website option enabled (see http://help.apple.com/icloud/#/mmc0cd7e99).  This will give you a private url to view them on the internet from a web browser.

You can't change the apps on icloud.com.